Rotary engine.



No. 812,368. PATENTED FEB. 13,1906.

- G. A. SANDBORG.

ROTARY ENGINE. 4

Y No. 812,368. PATENTBD FEB. 13, 1906.

. c. A. SANDBORG.

ROTARY ENGINE.

APPLICATION FILED MAY 8. 1905.

2 SHEETS-SHEET 2.

Lg is .541 22 1 .2. .2 Z;

i 5 E .12 7 i3 I II Witnesses with spaced CARL A. SANDBORG, OF BLOOMINGTON, ILLINOIS.

ROTARY ENGINE.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed May 8, 1905. Serial No. 259,406.

To aZZ whom, it may concern:

Be it known that I, CARL A. SANDBORG, a citizen of the United States, residing at Bloomington, in the county of McLean and State of Illinois, have invented a new and useful Rotary Engine, of which the following is a specification.

This invention relates to rotary engines, and has for its principal object to provide an engine of simple and economical construction in which the pressure of steam or other actuating fluid will be fully utilized and in which the parts are so arranged that the engine may start from any point.

A further object of the invention is to construct a novel form of engine in which radially-movable abutments are carried by a stationary piston member and are movable into and from expansion-chambers formed in a revoluble cylinder.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a sectional elevation of a rotary engine constructed in accordance with the invention. Fig. 2 is a transverse sectional view of the same on the line 2 2 of Fig. 1. Fig. 3 is a detail perspective view of a portion of the stationary piston. Fig. 4 is a similar view of one of the radially-movable abutments detached.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The bed-plate 10 of the engine is provided standards 11, having bearings for the reception of a shaft 12, having at one end a suitable belt-pulley 13. Secured to or formed integral with the frame is a piston 14, and by preference a portion of one wall of the piston is formed of a cap member 15, that forms a part of one of the shaft-bearings. The revoluble cylinder 16 is rigidly secured to the shaft and revolves around the piston. The piston 14 has an annular web 17, at the outer face of which is an annular groovefor I the reception of a packing-ring 18, that fits within a corresponding groove formed in the disk or web 19 of the cylinder, thus forming a circular space around the shaft for the reception of an inwardly-projecting cam-disk 20, that is carried by the revoluble cylinder and is provided with a continuous cam-groove 21- for operating the abutments 22, there being three of such abutments in the present instance and each abutment being provided with a stem 23, extending through a guidingopening in the web 17 and having an antifriction-roller 24 entering the cam-groove 21. The cylinder is further provided with four pockets or steam-spaces 25, arranged at equidistant intervals, and these are closed at one side by a detachable ring 26, secured to the cylinder and extending over the main flange of the stationary piston, said flange and ring having opposing grooves for the reception of a packing-ring 28.

- Extending radially from the periphery of the flange 17 of the piston to the outer edge of the flange 27 thereof are six partitions 30, dividing the periphery of the piston into as many pockets, the outer portions of which are partly closed by flanges 31, extending from the partitions 30 to auxiliary guidingflanges 33, also carried by the stationary piston. These guiding-flanges 33 are arranged in pairs and serve to receive the radially-movable abutments 22, and said abutments are provided with edge packing-strips 34 to prevent the passage of steam or other actuating fluid. The outer flange 27 of the piston is provided with three equidistantly spaced steam-inlet ports 37, all connected to a common steam-pipe, and three equidistantlyspaced exhaust-ports 38, that also are connected to a main exhaust.

In the operation of the engine steam is admitted through the ports 37 and passing through the piston-pockets enters between one wall of the abutment and the adjacent wall of the expansion-chamber 25, and as there are. three abutments equidistantly spaced from each other and four expansionchambers equidistantly spaced from each other it follows that while one is receiving full steam another will be wholly cut off and the third will be partly withdrawn into the peripheral line of the piston, so that under all clrcumstances the engine may be started merely by turning on the steam, there being no dead-point. As the cylinder rotates the curved wall of each of these pockets serves, in

connection with the curved cam-groove 21 to force the abutments within the lines of the piston, and as thecylinder moves further the steam within the chamber will be allowed to escape through one of the exhaust-ports 38.

Having thus described the invention, what is claimed is r 1. The combination with a frame, of a stationary piston supported thereby, radiallyslidable abutments carried by the piston, a shaft extending through said piston, a revoluble cylinder carried by the shaft and provided with steam-chambers into which the abutments may be moved, and a cam-disk carried by the cylinder for moving the abutments.

abutments and provided with pins or antifriction-rollers entering said cam-groove.

3. In a rotary engine, the combination with astationary piston having a pair of annular flanges disposed substantially at a right angle to each other and provided with a plurality of radial partitions dividing the periphery of the piston into a series of pockets, a revoluble piston having a plurality of steamchambers, packing-rings between the flanges of the piston and the cylinder, a disk carried by the cylinder and provided with a camgroove, radially-movable abutments carried by the piston, guiding means for such abutments, and stems secured to such abutments and provided with pins or antifrictionerollers entering said cam-groove.

In testimony that I claim the foregoing as my own I have hereto afiixed my signature in the presence of two witnesses.

CARL A. SANDBORG. 

